Injection molding machine

Abstract

An injection molding machine includes first and second friction members, an expandable/retractable member provided in a periphery of the first and second friction members and including first and second end parts, a first attachment member attached to the first end part, and a second attachment member attached to the second end part. A lubricating oil is fed to an area between first and second friction members. A position of the second attachment member relative to the first attachment member is displaced in cooperation with a position of the second friction member relative to the first friction member. The expandable/retractable member is configured to form a reservoir space that stores the lubricating oil in the periphery of the first and second friction members. The expandable/retractable member is configured to expand/retract in correspondence with an interval between the first attachment member and the second attachment member.

What is claimed is: 
     
       1. An injection molding machine, comprising:
 a first friction member; 
 a second friction member, the first and second friction members being connected to move relative to each other; 
 a screw coupled to one of the first friction member and the second friction member; 
 a base; 
 a plasticizing motor coupled to the other of the first friction member and the second friction member, the plasticizing motor configured to rotate the screw, the plasticizing motor not being movable relative to the base; 
 an expandable/retractable member provided in a periphery of the first and second friction members and including first and second end parts; 
 a first attachment member attached to the first end part; 
 a second attachment member attached to the second end part, one of the first and second attachment members being fixed to the base, the other of the first and second attachment members being movable with respect to the base along an axial direction of the screw; and 
 an injection motor configured to move the screw with respect to the base by way of the one of the first and second friction members coupled to the screw, the injection motor being fixed to the other of the first and second attachment members movable with respect to the base along the axial direction of the screw, the injection motor being configured to move together with the other of the first and second attachment members movable with respect to the base along the axial direction of the screw, 
 wherein a lubricating oil is fed to an area between first and second friction members, 
 wherein a position of the second attachment member relative to the first attachment member is displaced in cooperation with a position of the second friction member relative to the first friction member, 
 wherein the expandable/retractable member is configured to form a reservoir space that stores the lubricating oil in the periphery of the first and second friction members, 
 wherein the expandable/retractable member is configured to expand/retract in correspondence with an interval between the first and second attachment members. 
 
     
     
       2. The injection molding machine as claimed in  claim 1 , further comprising:
 a feeding part configured to feed the lubricating oil to the reservoir space. 
 
     
     
       3. The injection molding machine as claimed in  claim 1 , further comprising:
 a discharge part configured to discharge the lubricating oil from the reservoir space to outside of the injection molding machine. 
 
     
     
       4. The injection molding machine as claimed in  claim 1 , further comprising:
 a detection part configured to detect an amount of the lubricating oil in the reservoir space. 
 
     
     
       5. The injection molding machine as claimed in  claim 4 , further comprising:
 an output part configured to output an alarm based on a detection result of the detection part. 
 
     
     
       6. The injection molding machine as claimed in  claim 4 , further comprising:
 a controller configured to control the amount of the lubricating oil in the reservoir space based on a detection result of the detection part. 
 
     
     
       7. The injection molding machine as claimed in  claim 1 ,
 wherein a feed port is provided in one of the first and second attachment members and a discharge port is provided in the other one of the first and second attachment members, 
 wherein the lubricating oil that is fed from the feed port passes through the reservoir space and is discharged from the discharge port. 
 
     
     
       8. The injection molding machine as claimed in  claim 1 ,
 wherein the plasticizing motor is coupled to the first friction member, and the first attachment member is fixed to the base.